The Variant Saga Books in Order

After a deadly gas drives humanity underground, scientists create children designed to survive the changed surface. Terry grows up inside this experiment, where harsh training and concealed information complicate the mission to reclaim the world.

Terry and Ludo escape captivity with an army pursuing them across the continent. Their journey north becomes a desperate effort to rescue Ludo's wife, even as the dangers of their shattered world keep closing in.

Terry is stranded among ancient ruins on a distant world, troubled by voices he cannot explain. Back on Earth, Mei defies orders to investigate the rift, risking catastrophe in her search for answers.

War threatens the Everlasting as the Garden targets its leaders and failing defenses endanger millions. While Mei searches for a solution to the Variant, Terry travels through unfamiliar lands toward an artifact that could change the conflict.